body {
  max-width: 600px;
  margin: 0 auto;
  padding-top: 72px;
}

.square {
  width:      50px;
  height:     50px;
  background: #F64040;
  position:   absolute;
  top:        10px;
  left:       50%;
  margin-left: -25px;
  margin-top:  -25px;
}
